US2403269A - Projector for page printers - Google Patents

Description

July 2, l1946.

w. H. EDDY PROJECTOR FOR `ILAGE PRINTERS Filed July 17, 1940 6 Sheets-Sheet 2 wILuAM H. EDDY 25J K BV@ ToRNsY July 2, 1946. w. H. EDDY 2,403,269 l V PROJECTOR FOR PAGE PRINTERS l l Filed July 17', 1940 s sheets-snm :s

L|89 l lso mveNToR i WILLIAM H. EDDY ATTORNEY July 2,1946. w. H. EDDY 2,493,269

PROJECTQR FO R `PAGE PRINTERS Fileduuly 17, 1940 v s sheets-sheet 4 r 8| I I8 FIG, 6 l A |28 l |23 [26 y y41a FIG.i 7

INVENTOR WILLIAM H. EDDY TToRNEY JUIYIZ, 194.6. w.rH. EDDY PROJECTOR FRv PAGE PRINTERS -*ieduuly 17, 1940 v mvENToR v w|LL1AMH. EDDY BY JM AT oRNEY July 2, 1945 1 S'N. H. EDDY n PROJECTOR FOR PAGE PRINTRS 6 Sheets-Sheet y6 Filed July 17. 1940 l INVENToR w|LL|AM Hf EDDY BY J E NNN ATT Ey Patented July 2, 1946 William H. Eddy, Downers Grove, 1li., assignor tol Tclctype Corporation, Chicago, Ill., a corporation of Delaware Application July 17, 1940, Serial No. 346,002

11 Claims.

The present invention pertains to printing telegraph projection systems and apparatus and more particularly to 'combination page printers and projectors for displaying on a screen or in.

spection area information in enlarged characters.

'I'he primary'object of the invention istoprovide a page printer-projector which is capable of operating reliably and efficiently in any angular position.

Another object of the invention is to provide a mechanism for automatically controlling the weight of printing upon the record material so as to produce upon the screen images of uniform distinctness.

According to the present invention a projection system has been provided which embodies a page printer, of the type shown in U. S. Patent No. 1,904,164, designed to give upon a screen a running account of receivedv message matter, through the instrumentality of an optical system comprising an arrangement of inclined mirrors so that the printer and lamp housing may be located at the lower part of a suitable cabinet,

and the screen formed as a part of the upper for-v ward wall of the cabinet and positioned above the printer compartment.

Specifically, the page printer is mounted on rails supported in a structural frame to Which is pivotally mounted the lamp housing, in such manner that the lamp housing with its condensing lenses is positionable so as to embrace within the system;

' lamp housing and part of the optical arrange--v of the invention will appear from the following detailedi description taken in conjunction with the accompanying drawings, in which,

Fig. 1v is a perspective view of the projection cabinet with a part of the Wall broken away to show schematically the optical and projection Fig. 2 is a cross-sectional 'view of the printerprojector according to the present invention;

Fig. 3 is a cross-sectional view of the printer showing a printing impact equalizing mechamsm;

Fig. 4 iS a detail cross-sectional view taken on line 4--4 of Fig. 2;

Fig. 5 is an enlarged side view of a type bar head;

Fig. 6 is an enlarged side view and partial section of the printer mechanism and associated ment;

Fig. '7 is a perspective view of the printer impact equalizing mechanism according to the presof the printerprojector;

Fig. 10 is a. sectional view taken on line Iii-I0 of Fig. 9;

Fig. l1 is an enlarged cross-sectional view of the printer platen and platen frame;

field of projection the last line of printing, and

also to include eight or ten printed lines. Printing is eiected on a Cellophane strip and the image of the record produced thereon is'projected through the optical system onto the screen.

The Cellophane web or strip is drawn upwardly through the projection ileld. 'I'he characters on the section of the web in the projection field are so arranged as to form horizontal lines one above the other, and the images of said horizontal lines ing lenses is swingable upwardly about its pivotal articulation with the structural frame to permit ready access to the page printer, which is slidable on rails so that when the lamp housing is raised, the printer may be slid outwardly to permit Withdrawal and thus lrender't accessible for servicing.

The foregoing and other objects and features 55 net, indicated generally by'the numeral I I, which is provided in the lower portion thereof with a door I2, and in the upper portion with a trans- Fig. 12 is a. view taken substantially on line I2-I2 of Fig. 11; and

Fig. 13 is a top view of the part of the printer mechanism shown in Figs. 11 and 12.

Having reference to the drawings in which like reference characters indicate similar parts throughout the several views, the combination page printing and projecting apparatus according to the present invention is housed in a cabilucent projector screen I3. Secured to the iioor of cabinet Il are two-angle iron rails I4 (only A one of which is vshown in Fig. 1) which provide a track for the frame I5 (Fig. 2) which supports the page printing apparatus, indicated generally by the numeral I6, the lamp housing I'l, and the .optical arrangement represented generally -by -condensing 1enses`l 8, small mirror I9 and ob-v jective lens 2|. Wheels 22 are journaled to the bottom side members ofthe frame I5 andcooperate in rolling relation with rails I4, whichare provided with indentations 23 into lwhich the Y wheels 22 are admitted II, rests upon spacing bosses 25. In the fully inserted position, the frame I -is anchored by means of bolts 99to the base of the cabinet I I. With this arrangement, the frame is easily insertable in Ythe cabinet IlY by means of rollers 22, and moreover is adapted, when the proper position has been assumed, to rest upon spacers and to be anchored to the cabinet by the bolts.

At each side of frame I5 and disposed at the when the frame I5, 'in assuming its fully inserted position in the cabinet mirror I9 and theobjective lens 2| facilitate the proper positionment ofthe image on the screen.

Mirror 5I is supportedat three points to minimize, or even eliminate the possibility of injury to the mirror due to a twisting action. Mirror 5I is secured to the cabinet II through the instrumentality of a bracket 58 located centrally rear thereof are pivot supports 24 for a frame 26 l which carries the lamp housing I1 and condenser lenses I8. A bar 29 (Fig. 6) ispivoted to frame Y 26, and the lower end of said bar is provided with a hook portion (not shown) which, when the frame 26 is swung upwardly about pivots '24 to facilitate removal of theprinter for servicing, is

held in its upward position by the engagement of said hooked portion with spacer stud 9 (Fig. 8) in well-known manner, the bar 29 thus serving as a brace or support. The lamp housing I1 comprises an outer casing 21 (Fig. 2) which is secured to a plate 28 fastened to a crossbar 29 of( the frame 26. Contained within the lamp housing I1 and suitably spaced from the outer casing 21 thereof is a baiile plate 3l which rests upon the bottom of thehousing l1 and extends upwardly to a point close to the top, as illustrated in Fig. 2. The ybottom of the housing I1 is provided, between the outer casing 21 and the baille plate 3 I, with apertures 32.. This construction permits the ow of convection currents between the outer casing 21 and the baille plate 3| for cooling purposes. Housing I1 is provided with a cover 33 having a grilled section 34Lcov'ered by a meshing if desired. Depending fromA the cover 33 and spaced therefrom is a baille plate 36 (Fig. 2) of substantially the same area as the opening 34'. To

protect the condensing lenses I8 from the heat of the `bottom edge of the mirror. At each of "the upper corners of mirror 5I is provided a tioned behind the mirror 5I.-

bracket 59 by means of which themirror is secured to the roof of cabinet II. Mirror 5I is in the form of a regular trapezoid, with the shorter of the parallel sides positioned contiguous to bracket 58. The trapezoidal shape of the mirror 5I conforms to the eiective shape of the eld of projection at the angle at which mirror 5I is placed in cabinet I i. Mirror 5I, so shaped, produces a rectangular visual iield or eld of projec- 'tion on screen I3, which accordingly is of rec-y tangular conformation.

A blower or exhaust fan 14 (Fig. 1) is located at the upper part of the cabinet II and is posi- Y Blower 14 is so mounted that its exhaust port projects through an aperture 16 in cabinet II, and is suitably supported in said cabinet.

Having reference to Fig. 2, a page printer of the type shown. in U. S. Patent No. 1,904,164 is mounted in the frame I5. The printer, indicated generally as IS, has been modified in certain respects to adapt it for use with the projectorfof the present invention. The page printer` comprises of lamp 31, the bottom ofl the housing I1 may be cut away immediately adjacent thereto, to afford greater ventilation thereabout. Lamp 31 is fadjustably clamped to a bracket 3'9, which in turn'is adjustably supported by the floor vof the housing l1. A reector 4I is springclamped by a carrier 42 which is adjustably supported, through the instrumentality of a rod 43 and the enlarged mounting holes for plates 45, by the outer casing 21 of the lamp housing I1.

'In the embodiment of the invention shown in the drawings, a condensing lens system I8, comprising two plano-convex lenses and one convexe-convexlens, is provided, these lenses being suitably clampedbyY clamps 94 to plates 28, 46,

and 41 which are appropriately separated byv through the printing zone. I 49 in being withdrawn from the roll 83 is dithe side frames 18 and 19 (Fig. 6) to which is `pivoted at 8| a platen frame indicated generally as 82. The usual cylindrical form of platen has been dispensed with4 in the present embodiment of the invention and has been substituted by the disc form of platen I13 shown in Figs. 11, 12, and 13, and which will be hereinafter described.

To providefarunning account of the message printed on the page material, a delivery mechanismvis provided which comprises a means for permitting the record material to escape from the supply roll, suitableguides, and a web pulling means whereby the page material is advanced The page material rected over a slack bar 84 which is pivoted at 85 and is normally biased clockwise by a spring As previously mentioned, the optical system of the present invention includes a mirror I 9 and an objective lens 2l.l The optical system also in-y cludes a mirror 5I (Fig. 1) supported in the upper part of the cabinet Il, and through this system the image is projected upoithe screen I3. The mirror I9 is adjustably pivoted on a pair of standards 52 by means of which its angular position may be determined. `Moreover, standards 52 are A adjustably mounted on brackets 53 secured to 75 the pressure roller 94 from engagement with 86 to maintain the page material or cellophane web taut between the roll 83 and a anged cylindrical guide 81 carried on a, shaft 88 journaled in plates 89 depending from side frames 18 and 19.; 'I'he web 49 is ,then directed over-a roller 9| to which is xed a ratchet wheel 92, the ratchet wheel and roher being carried on a shaft 93 l journaled in the plates 89secured to side trames 18 and 19. Cooperating with the roller, 9| is a pressure roller 94 which is carried ona standard 96 secured to a rock shaft 91. Pressure roller 94 is drawn into pressing relation with roller 9I by means of a spring 98. Secured to rock shaft 91 and located in juxtaposition to plate 89 is a pressure roller release lever 99. Cooperating with lever 99 is a shoulder IDI on plate 89 arranged so that whenlever 99 is actuated counterclock- Wise (as viewed in Fig. 6) against the action of spring98 it will latch up behind or on the lefthand side of the shoulder IBI, thereby releasing Y connected in a signal line (not shown) on which s Patent No. 1,904,164.

shoulder to permit spring 98l to bring rollerv 94 again into pressing relation with roller 9|. Associated with the ratchet wheel 92 is a pawl member |02 (Fig. 2) which is pivoted toa bell crank lever |03 carried on a pivot shaft |04; The

depending arm of bell crank |03 is pivoted to onev end of a push rod |06, the other end of which is shouldered to cooperate with a function bail |08 in the manner shown in the aforementioned Thus, in response to a predetermined selection a function lever similar to function lever |01 shown in Fig. 6 is selected to raise the free end of push bar |06 upwardly into the path of the,function bail blade |08. Then','when the push rod |06 is actuated 'leftwardly by the function bail |08, clockwise rotation is'imparted to bell crank lever |03 to. irnpart'in turn, downward movement to pawl |02.

In this manner, the ratchet wheel 92 is rotated' clockwise one step, which, through the cooperation of lpressure rollers 9 I and 94, acts in 'cooperation 'v'vith a web vpulling device to deliver 'a predetermined lamount of record'material 49 vfrom the supply roll 83 to the printing zone andthe projection area.

may take the form of a fixed rod carrying guiderollers thereon to eliminate friction. From the guide rod ||2 the record material 49 is directed vertically through the printing zone and projection area to a guide rod i3 carried by a U-shaped shifting frame member ||4 (Figs. 2, 6, and 8) pivotally `carried on pivots ||5 and |6 (Fig. 8)

vsuitably journaled in the frame l5. The page material 49 is then directed around a guide rod ||1 carried in supports ||8 (Fig. 6) depending from bars ||9 secured to'angle iron cross bars |2| and |22 of frame I5. From thence, the page material 49 is directed around a spindle |23 fixed to a shaft |24 journaled in standards |26 supported on said bars H9.

Shaft |24 is interconnected through a friction clutch |21 to a pulley |28. Continuous counterclockwise rotation (as viewed in Fig. 6) is imparted to pulley |28 through the instrumentality of a belt I294c'onnected to a pulley |3| fixedV to the main operating shaft |32 of the page printing apparatus shown in Patent No. 1,904,164. Shaft. I32carries a gear |33 which meshes with'a pinion gear |34 fixed to shaft |35 of a motor |36 (Fig. 2). Motor |36, therefore, through gears |34 and |33, shaft |32, pulley |3|, and belt |29 imparts continuous rotation to pulley |28 which, through the friction clutch |21, imparts a co'n- Y tom side thereof on a stud |55.

ates between a pair of blades |56 and |51 of a stant torque through shaft |24 to the spindle |23. `With this arrangement the page material 49 in maintained in a taut condition between the spindle |23 and the roller 9|. Thus, when the ratchet 92 yis rotated one step a predetermined amount of the page material 49 is delivered from the supply roller 83, which material is immediately taken up by the spindle |23 to preserve the` taut condition of the page material.

As disclosed in the aforementioned Patent No. 1,904,164, the page printerr |6 is controlled telegraphically by a selector magnet |31. This is are impressed code combinations of signalling impulses. The code Asignals control, through a v(i and 9).

|38 which, in turn, controls through bell cranks |39 (Fig. 9), a set of curvedcode bars |4| (Figs.l Code bars |4| and .bell cranks |39 are supported on a movable type carriage. indicated generally by the numeral |42, which is provided with rollers |43 and |44 whereby it is adapted to travel on tracks |45 and |46, respectively, positioned between side frames 184 and 19. Cooperating with co'de bars |4| are a plurality of pull bars |41 having individual springs |48.` Pull bars |41 are operatively connected by rack and pinion connections to a corresponding plurality of type bars |49 pivoted on a shaft |5|.

Type carriage |42 is also provided with a' spacing rack l|52 which cooperates with a spacing mechanismmot shown) similar to that illustrated in Patent No. 1,904,164, to control the movement of type carriage |42 to form character spaces, tending in this'movement to wind up a carriage return spring mechanism indicated generally in Fig. 8 as |50, the strap |60 ofwhich is secured to stud |10 fastened to type carriage |42. Upon receipt of the `carriage return signal, a function lever (similar t'o lever |01) is selected and the carriage return mechanism actuated inl the manner described in the aforementioned. Patent No. 1,904,164. Carriage return mechanism |50 is thereupon permitted,l due to the energy stored therein, to return the type carriage |42 to its normal or beginning-of-line position. A pull bar bail |53 is mounted in the type carriage |42A and i's provided with a roller |54 carried on the bot- Roller |54 oper-- mainA printing bail |58 so that bail |53 can be reciprocated by bail |58 in any character spacing position of the type carriage` |42. Fastened to the printing bail |58 is one end of a printing spring |59, the other end of which is connected to ya printing blow adjustment means as shown in Patent No. 1,904,164. Bail |58 is mounted on a shaft |6| on which is also carried a printing bail actuator |62 which cooperates with a printing cam |63. Actuator |62 carries at the end of its upper arm astud |64 which has abutting relation only with printing bail |58 and is notl permanently connected thereto, which is to permit spring printing. Printing bail |58 is also provided with a pair of arms |66 which carry a function lever bail |69. Also carried on shaft 6| is a function bail comprising arms |65, |66, and |61. Arm |65 is provided with'a follower roller which cooperates with a function bail cam |68, and arm |61 supports on its end the function bail blade |08.

Associated with the selector vanes |38 are a plurality of function levers |01 mounted on pivot rod |1I and provided with individual springs |12 which tend to rotate the function levers clockwise into registry withv the selector vanes |38. The function 1evers |01 are normally held out of engagement with the selector vanes |38 `by means of the rod |69 of the function lever bail. As previously mentioned, the platen frame 82 is pivotally supported on pivots 8| in side frames 7. with the printing point or zone determined by the path of operation of the typebar |89.

The platen frame 82 is .adapted to be rocked from the letters or unshift position to the iigures or shift position in the manner fully set forth in theA aforementioned Patent No. 1,904,164. Briefly, the side frame of the platen frame. 82 (as shown in Fig. 6) is providedwith a lug |11 which operates between two adjustable stops |18 and |19. Adjacent to lug |11 there is pivoted to the side frame of the platen frame 820m pivot I 8 I, the upper end of a link 82, the lower end of which is pivoted to the horizontal arm of a bell crank lever |83 pivotally mounted at |84. To the lower end of the depending arm of bell crank V|83 is pivoted a push bar'i 85, the free end of which overlies a rearwardlydirected arm of the function lever |01. Push bar |85 is also'provided with a shoulder |88 which cooperates with the function lever bail blade |08.v The platen frame 88 and platen |13 are shown in the letters or unshift position, with the stop lug |11 against the upper stop screw |18. This condition is achieved when the function bail blade |08 has operated upon.the shoulder |86 to move the push bar |85 leftwardly to rotate the bell crank |83 clockwise, thus raising the link |82 to cause the platen frame 82 to rock clockwise.

A correspondingly similar construction is provided for the figures or shift mechanism. I'hat is. a shift function lever |80, similar to lever |01, is provided which when selected is caused to rotate clockwise to bring its rearwardly extending arm into operation to raise a push bar, similar to .bar |85, into the' path of the function bail blade |98 which, when it is permitted to operate lei'twardly (as viewed in Fig. 6), will cause a bell crank, similar tol bell crank |83, to pull down a link similar to |82 to rock the platen frame 82 counterclockwise to bring itsy stop |11 against the lower stop screw |19. T he platen frame -82 is maintained in its shift or unshift position by a face of the platen |18 is` parallel to the record strip when the platen frame 82 has been shifted to the upper case position, as indicated in Fig. 11, by the dotted line |94 of the platen |13,

To compensate 'for this arrangementy of thel platen |13, the type faces on the type bar |49 are arranged as shown in Fig. 5. Moreover, this arrangement of type faces in cooperation with a shield |95 (Fig. 1l) serves (as will presently appear) to prevent smudging during the printingV operation. As is well known, the type bar-|49 is provided with an upper case type face |96 and a lower case type face |91. to the present invention the lower case type face |91 is provided with a slope corresponding to the However, according slope of the periphery ofthe platen |13 when;

in the lower case position. The dimension 201 of the upper case type |96 is arranged to be slightly less than the minimumheight 2|0 of the lower case type |91. When printing is eiected in the lower case position, the type face |96 being lower than the type face |91, will not touch the record material and hence noA smudging of the sition, means is provided for preventing the lower spring actuated detent member |81 acting on a'- detent roller |88.

In Figs. l1, 12, and'13 is illustrated the manner in which the platen carriage |14 is connected to the type carriage |42 so `as to be movable therewith. As previously mentioned, the platen carriage |14 is slidably `supported on rods I 15 and -|18. Carriage |14 is provided with an eccentric stud engaged by the forked end of a bar |89, the left'end of which (as viewed in Fig. .12) -is secured to a member |9| which is secured by screws |92 to the type carriage |42. As viewed in Fig. 13, the circular platen |13 is rotatably mounted on the platen carriage |14 by means of an eccentric means |93. By means of the adjustment |93 the platen |13 is adjustable toward and away from. the record material to vary the clearance therebetween. Rightward and leftward adjust` ment, as viewed in Figs. 12 and 13, is also provided for the platen |13, through the instrumentality of the eccentric adjusting means |90.

An important feature of the present invention is the provision of a platen so positioned as to reduce to a minimum the obstruction of the pro-` jected image by the platen. To achieve thisv result the platen- |13 is tilted with respect to the record material printed upon, sufficiently to clear the light cone. The peripheral surface of the platen |13, upon which printing is eected,

sitions ofthe platen the peripheral surface of the platen will be parallel to the record material. In the present embodimentthe peripheral surtioned Patent N o.

printed record will occur.

When printing is effected in the upper case poent No. 1,904,164, oscillates the inking ribbon into and out of the path of the type faces during theprinting operation. The ribbon oscillator |99 pivotally articulated to arm 20| of a lever 202 which, in turn, is pivoted at 203 to a lever 205 pivoted at 220 to the type carriageldZ. Lever 204 is arranged to carry a roller 205 which rides on the bottom side of a rail 208 mounted on the platen frame 82, as disclosed in the aforemen 1,904,164. Roller 205 is pressed against the rail 206 byl a spring (not shown), so that when the platen frame 82 is rocked between the shift and unshift positions, roller 205 will constantly contact with said rail 205, and lever 202 will be reciprocated therewith.

The depending arm A20|? of the lever 202 is operably associated with the pull bar bail |53 (Fig.

2) so that the reciprocative motion of bail |53` will cause the oscillation of the lever 202 about pivot 203', whether the platen frame 82 is in the shift or the unshift. position. Thus, when the bail |53 is in its normal position (the leftwardL will be raised to printing position due to the counterclockwiseV movement imparted tothe lever 202 by the bail |53. When the platen frame 82 is in the position shown in Fig..9, which is the lowercase printing position, the shield |95,

. is slightly beveled so that `in one of the shift pouponoscillation of lever 202, will not be raised suiciently to be interposed between the type face |91'and the platen |13. However, when the platen frame 82 is in the upper case printing position with the platen |13 in printing relation with the upper case type face |96, the shield |95 will, upon reciprocation, be raised so as to become i I coiled spring 200,v a taut 9 l interposed between the lower case type face |91 and the record material, thus preventingany which has accumulated on the type face |91 from smudging the record material.

. As iuustrated in Figs, 11, 12, and 13, there is provided a platen rotator for automatically changing the printing point of the platen |13 in response to each carriage return operation. As previously.described,` the platen |13 spaces with the type carriage |42, and accordingly is spaced step-by-step for character spacing and, upon 10 spring return mechanism 233 is mounted on a bracket v234 secured to the frame |5.

As the carriage |42 advances step by step in response to the spacing mechanism, the carriage vreturnspring mechanism |50 is wound up and energy is stored therein in readiness to return the carriage.l At the same time, the carriage return mechanism 233 is also wound up to'store energy ltherein', sothat when the carriage return signal reaching the end of the line, the platen |13 .is

returnedrapidly with the carriage |42 to the beginning-of-line position. In contact with the platen |13 at a point opposite to the printing v stored up inthe return mechanisms |50 and 233.`

point is a closely wound coiled spring 200 which .bers o! the platen supporting frame 32, in such a manner that the platen |13 is4 caused to rotate as it advances duringJ character spacing. lil/[ore-v over. upon the rapid return movement of the platen |13 (under the influence of the carriage return spring |50) during the performance oi the is connected at its ends to theside frame mem,-

is received bythe printer the carriage is freed in the .manner ydescribed in the aforementionedPatent N o. 1,904,164', and the carriage return opera, tion is effected through the release of the energy In; the embodiment shown in Fig. 8, the return of the carriage |42 and the counterweig'ht 2I1. is illustrated aseffected by two return mechanisms,

the return mechanism |50 acting' directly upon the type carriage |42 yand the return mechacarriage return function, the platen |13 will, ow-

ing to the combined sliding and rolling relation with the yieldable spring member 200, rotate incommensurately, thus causing the same printing cated either at the position shown by the return point of the platen to ,be presented to the type bars va minimum number of times.- In-other words, through lthe instrumentality of the platen rotator 200, the platen |13 is controlled ln'such manner as toreduce to a minimum the number of times any particular printingpoint on the platen is impinged upon, thereby reducing to a minimum the wear at, any given point and hence prolonging the life of t'he platen. In lieu of the Wire or cord, of course,

can be used.

In accordance with the present invention, the

I printing apparatus used in combination Awith the projection lsystem is of such structureI and arrangement that it is not affected by change in physical position of the assembly as a whole with respect to gravity. Specifically, a, eounterweight is provided which is -associated withthe movable type carriage |42 so as to render the movement of the type carriage |42 independent of nism 233 acting directly upon the counterwelght 2|1.'l The tworeturn mechanisms cooperate to facilitate the return of both devices. If desired, a single return mechanism may be employed by providing a return spring mechanism of suiilcient strength to return bothdevices. .In this event, the spring return mechanism may be lomechanism |50 or by the return mechanism 233..'

Therarriage return' mechanism |50 is provided with adashpt buffer mechanism as is shown and aforementioned Patent No.

described yin. the 1,904,164.

` Thekcounterweight return mechanismf is simi- 'i larly provided with a buffer mechanism. 'I'hisI buii'er mechanism for the counterweight 2 I 1 comprises a dashpot 235 suitably mounted in the plate 236 secured t0 frame I5. Pivotally .sup-

' ported at 231 on bracket 240 and properly positioned with respect to buffer 235 is a buffer lever 23B.. The rounded end of lever 238 fits into a notched portion ci the plunger 239 of the bluifer 235. End 24| of the plunger 239 is adapted to receive the blow from the counterweight 2 I1, said the force of gravity and to assist theA carriage return spring in uniformly moving the type carriage in any physical position of the printer.

vis movably supported on tracks |45 and |48, and

.after being operated upon'by the spacing mecha-` in the frame I5. Secured to end 2|9 of bar 2I2 is a stra-p 22| which extends around anl idler roller 222 and is fastened at 223 to the counterf weight 2|1. nner roller mis rotatably mourned on the bar 2I8. Counterwelght 2|1 is provided with rollers 224 and 225 which roll on upper rail 228. and rollers 221 and 228 which roll on lower 'rail 229. Rails 226 and 229 are appropriately supported-in the frame I5. Secured at 23| to the counterweight 2|1 is a. strap 232 of a springreturn mechanism 233 comparable to the carriage return spring mechanism |59. The

As previously described, the type carriagev` |42 l end 24| being receivable in the counterbore 242 -in the counterweight 231. The counterbore 242 is indicated in the present embodiment for structural purposes only and is not an essential element of the structure.V The resistance of pneumatic buffer 235 is varied by means of adjustable ports, in a well-known manner. A spring 243 tends to rotate lever 238 in a counterclockwise ,-directioniFig. 8) about pivot 231 to restore the -buil'er mechanism to its operative position.

Normally, in making a printed recordthe impact of the type faces against the :platen in the lower caseposition is slightly greater than it is in the upper case position of type faces |96, due to the fact that the lower case type faces |91 are closer to the tylpe bar pivot |5| than are the upper case typefaces |96.I In an'ordinary printed record the slight difference in density of printing in each case is not discernible.. However, due to the characteristics oi the transparent web upon which printing is effected for projection, this difference of density oi' printing is more noticei able. To compensate for this variation in density of printing, the .present invention provides means for equalizing the prlntingimpact of the lower and upper case type faces automatically, so that printing of equal density is produced wpon the record material. The variation in density of printing is more noticeablewhen printing is effected upon transparent record material, such as is used in printer-projector apparatus oi' the type according to the present invention.`

f il y Having reference to Figs. 3 and '7, a lever 245 is pivoted at 246 to a plate 241 which is adjustably mounted by means ,of slot-and-screw adjusting means to bracket 248 carried by printer frame 19. A spring 249 extends between the upper end of lever 245 and a spring post 25| carried on printing bail |58. The Ilower end of lever 245 is provided with a laterally extending portion 252 which 'cooperates with a depending projection 253 on the upper case -shift push bar 254.l Lower case and upper case push bars |85 and 254, respectively, are articulated to a platen shift control lever 255 pivoted at 256 in the printer in such manner that lever 255 isrotated in a counterclockwise direction (as viewed in Fig. 7) when push bar 254 is operated leftwardly by the function bailblade |88, and in a clockwise direction when .push bar |85 is operated leftwardly. Push bar 254 is maintained in operative relation with control lever 255 by a spring 251 extending from projection 253 on bar 254 to a projection 258 on lever 255. Simif larly, push rod |85 is maintained in operative relation with control lever 255 by a spring 259 extending from projection 26| on bar |85 to projection 262 on lever 255.

To print a character, the code signal corresponding thereto is received by the selector magneti |31 (Fig. 6) which, in turn, controls, through selector vanes |38 and bell crank levers |39, the

`setting of code bars |4|. 'I'he selector cam drum associated with selector magnet |31 controls (as f described in Patent No. 1,904,164) the initiation of rotation of operating shaft |32 which carries the printing cam |63 and the function cam |68.

' In proper timed relation with the setting of code bars |4I, the printing bail |58 is operated under control of cam |83 to cause the reciprocation,

tion 252 of lever 255, thereby imparting counterclockwise movement to lever 255 to stretch the spring 269, thus increasing the tension therein. Now, when the printing bail |58 is operatedin response to subsequent character code signals, the pull of the printing spring |59 will be resisted by the pull of spring 249, thereby reducing the force of the printing blow, so that `the impact'of printing is equal in both upper and lower case.

When the upper case or .figures shiftl signal is received, the gures shift function lever |88 is selected and operated to bring shoulder 263 of push bar 258 into the path of function lever bail blade |88, which, when operated, urges push bar B leftwardly to impart counterclockwise rotation to lever 255, which movement will cause,

. through -bell crank lever |83 and link 82, the

through the instrumentality of roller |55, of pull bar b'ail |53, which, through the rack and pinion articulation between pull bars |41 and type bars |49 will cause the impingement of the selected' type bar against the platen |13 to eiiect printing.

The power for effecting the printing operation is supplied by the printing spring |59 and, as previously mentioned, a means is provided f or automatically varying the power supplied by said spring in -accordance with the case shift condition of the printer. It has been found upon magnification of the printed record incident to projection upon a screen, that the diierence in the 'distances of the upper and lower typefaces from the type bar pivot causes a difference in the weight of printing which indicates a difference in the printing impact of said type faces. To

equalize the printing impact so that it is substantially the' same in bothupper and lower case, the spring 249 is provided, which in the lower case position is caused to resist the movement-of the printing spring |59, thereby reducing the impact of the lower case type face against the platen suiiiciently to equal the corresponding impact a of the upper case type face.

Upon receipt of the lower case or letters shift signal, the "letters" `'shift function lever |81 is selected andv operated in the manner described in Patent No. 1,904,164 to raise push bar |85 to bring shoulder |86 thereon into the path of function lever bail blade |08 which, when operated, urges push bar'l85 leftwardly (as viewed in Fig. 7) to` impart clockwise rotation .to control lever 255. Lever 255, besides effecting the shift of the platen frame 82 to the letters case position (as indi-` y cated in Figs. l3 and 6), causes the push bar 254 to be moved rlghtwardly, and in so doing, the projection 253 thereon engages .the lateral'pl- '75 return mechanisms to render said mechanismst position with projection |11 bearing against stop |19. Moreover, push bar |85 will be shifted rightwardly, and projection 253 of bar 254 will be moved away from and out of operative engagement with lateral portion 252 of lever 245. Spring 249 will thereupon be rendered ineiective, since lever 245 and spring 289 are now free to move with printing bail |58, and no resistance is offered by spring 259 to the printing spring |59. A spring 264 of very light tension extending from lever 245 to spring post 265 on bracket 248 is provided to take up the play of the mechanism.

. Although specic embodiments of the invention have been shown herein', it will be understood that the invention is capable yof modiiication, and it is intended that all forms which come within the range ofequivalency are' to be embraced Within the scope of the appended claims.

What is claimedis: l. In a printing device, a` carriage movable to `form character spaces, means for advancing said carriage, means for returning said carriage, and

- gravity responsive means cooperatively associated with said second recited means to render said second recited means effective irrespective of change in physical position of the printing device with respect to gravity.

'automatic means for moving said carriage in oney direction, means for moving said carriage in the opposite direction, and gravity responsive means l cooperatively associated with said second recited means to render said second recited means effective irrespective of change in physical position of the printing device with respect to gravity.

4. In a recorder, a stationary supporting framework, a type carriagemovable with respect 'to said stationary framework, a printing hail in said stationary framework, slidable connecting means between said carriage and said bail to effect recording operations, spacing mechanism eiective automatically for advancing said carriage an incremental amount during each recording operation, a carriage return vmechanism for restoring said carriage automatically to beginning-of-line position, and gravity responsive mean's cooperatively. associated with said spacing and carriage effective irrespective of change in physical posi-` tion of the recorder with respect to gravity.

5. In a printing device, a carriage, track means for facilitating the movement of .said carriage to form character spaces, means effective automat-il cally ,for moving said carriage in one direction,

energy storingand releasing means for moving said carriage in the opposite direction, a gravity responsive means, a second track means for facilitating the operation of said gravity responsive means with. respect to said carriage, and interconnecting instrumentalities between said carriage and said gravity responsive means, whereby said said carriage and said gravity responsive means,

whereby said gravity responsive means is effective to render both of said carriage moving means effective irrespective of change in physical position of the printing device with respect to gravity. f

7. In a printing device, a type carriage, track y means foi` facilitating the movement o f said carriage to form character spaces, means eiective automatically for moving said carriage in one direction, power storage means for moving said carriage in the opposite direction, a. gravity responsive means, a second track means for facilitating the operation of said gravity responsive means with respect to said carriage, and interconnecting instrumentalities between said carriage and said gravity responsive means, whereby said gravity responsive means is eiective to render both of said carriage moving means effective irrespective of Vchange in physical position of the printing device with respect to gravity.

8. In a recorder, a stationary part comprising a supporting framework, atype carriage movable 50 with respect to said frameworha printing bail in 14 said stationary part, slidable connecting means between said carriage and said bail to effect recording operations, spacing mechanism effective automatically for advancing said carriage an incremental amount during each recording operation, a carriage return mechanism for automatically restoring said carriage to beginning-of-line position, gravity responsive means, means for facilitating the operation oi said gravity responsive lomeans with respect to said carriage. and interconnecting instrunientalities between said carriage and said gravity responsive means, whereby .said gravity responsive means is effective to render said spacing and carriage return mechanism effective irrespectiveof change in physical position of the recorder with respect to gravity.

`9. In a recorder, a stationary part comprising a supporting framework, a type carriage movable with respect to said framework, a printing bail in said stationary part, slidable connecting means' between said carriage and said bail to effect recording operations, spacing mechanismeffective automatically for advancing said carriage an incrementali amount during each recording operation, power storage means for returning said carriage, and gravity responsive means cooper-I atively associated with` said power storage means.

to render said power storage means effective irrespective of change in physical position of the recorder with respect to gravity.

10. In aprinting device, a movable carriage,-

automatic means for moving said carriage in one direction, energy storing and releasing means for moving said carriage in the opposite direction, and gravity responsive means cooperatively associated with said energy storing and releasing means to render said energy storing and releasing means effective irrespectiveof change in physical position of., the printing device with respect to gravity.

' 11. In a printing device, a movable carriage, spacing mechanism 'eiiective automatically for moving said carriage in one direction,`carriage return mechanism for automatically moving said 45. carriage in the opposite direction, and gravity -responsive means to render both said mechanisms invariably effectiveA in a predetermined manner on said carriage irrespective of change 1n physical position'of said device with respect to gravity.

WILLIAM n. mDY.

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